I've been reading some posts from people who are holding off on buying the current SSR until the new model is offered with the 6.0 motor because it will be much faster. From my experience with the 6.0 motor there isn't that much difference between the 2 motors. I've owned a 2001 GMC Sierra C-3 with the 6.0 motor, 325 hp, 3:73 gears for over 3 yrs. and have lots of friends with the 5.3 motors and mine really isn't that much fasterthan theirs. It's better at hauling or pulling a load but the quarter mile times are about the same at 15.7 to 15.9. The 2004 Chevrolet Silverado SS has the 6.0 with 345 hp., 4:10 gears, weighs a tad more than the SSR at 5,013 lbs., and their quarter mile times are in the 15.0 to 15.2 range. At this time that is biggest amt. of hp GM has put into the 6.0. They could tweak it some more to gain additional hp for the SSR but at 4,760 lbs. it needs a Chevy big block 502 cu. in. motor to be considered FAST by today's standards. I didn't buy my SSR for speed and am very content with it the way it is but I hate to see potential buyers waiting on the sidelines for this "magical bullet" (the 6.0 motor) and then are disappointed when they see that the 6.0 doesn't turn the SSR into a real road rocket. It's a good motor, just not enough oomph to make the SSR much faster than the current 5.3 motor does. Of course this is just my opinion and I could be wrong!